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M9    Australia The University of Adelaide, Australia
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Structure and Control Optimisation for Compliant Micromotion Manipulator
The current research is aimed to design a new micromanipulation system to provide micro/nano motion for such as performing intracytoplasmic sperm injection. This is a procedure used in invitro-fertilisation where a human egg is injected with sperm. This project uses piezoelectric actuators and a novel compliant mechanism in order to achieve ultra fine-motion. This current work is focused on the field of compliant mechanism research, and involves study of a particular topology of mechanism that provides 3 planar degrees of freedom.

(Daniel Handley)

 
Front view
Detail
Top view
 
Development of robot understanding
This research project attempts to undertake the task of developing and demonstrating robotic understanding. This is an extension of robotic learning implemented via a simplistic thought process and memory structure. The result of the project will be a visual thought process that shows robot's thought process and how the robot is able to use its past experiences to demonstrate its understanding of concepts.

(Ben Longstaff and Tien-Fu Lu)

 
Side view
The wheel
Suspension
 
Modeling of Compliant Micro-motion Stages with Flexure Hinges
This research project focuses on the methodology of deriving simple but effective kinematic and static models of compliant micro-motion stages which accurately represent the real system. The models will benefit the design and optimisation processes where a few micro-motion stage designs can be analysed quickly without the needs of using any commercially available finite-element software. A 3-DOF micro-motion stage, which is designed for the positioning of samples in a Scanning-Electron-Microscope (SEM), is selected as an example to develop this methodology.

(Yuen Kuan Yong and Tien-Fu Lu)

 
Prototype 1: Top View
Prototype 2: Top View
Prototype 2 and microscope
 
Pneumatic Hand
The School of Mechanical Engineering has been developing air-muscles since 2004. These have been used in a number of honours projects such as Stumpy: A Pneumatic Muscle Actuated Bi-pedal Robot. This project aims to build a fully functional pneumatic prosthetic that is low weight and has fast response times.

(George Osborne)

 
Mandarin
Hand with glove
 
 
Design of an autonomous mobile robot for experiments on multi-agent systems
The aim of this honours project is the design and construction of a fully autonomous mobile robot as a flexible platform for research in the area of robotic multi-agent systems and artificial intelligence. The robot will be designed in conformity with the regulations for the MiddleSize League (MSL, F-2000) of the international robotic soccer competition "RoboCup". Using RoboCup as test-bed, the project aims at developing new control strategies for collaborating multi-agent systems of autonomous mobile robots in a complex and dynamic environment. It is planned to build a competitive team which could enter the 9th RoboCup world championships in 2005.

This project has been launched in 2004. Students from Mechatronics, Mechanical Engineering, Computer Science and Electrical and Electronics Engineering have since been working as part of a faculty wide team.

(Frank Wornle)

 
Autonomous mobile robot
 
 
 
Development of a Stereo Vision and Multiple Laser Stripes based Robotics Measuring System for 3D large surface Profile Acquisition
The aim of this research project is to develop a Robotic Measuring System (RMS) which is used for large surface 3D data acquisition. Normally acquiring three-dimensional surface data can be achieved with precision by use of touch probes. However, computer vision and image processing is faster, especially for extracting a large amount of 3D data such as free-form surface features. The RMS integrates an industrial robot, a set of CCD camera, a laser stripe projector, and a personal computer with appropriate software to perform a large surface measuring task. Topics such as robot calibration, camera calibration, and measurement strategies are to be investigated.

(Jingsyan Torng)

 
Soccer Server - Artificial Intelligence (AI) for soccer playing mobile robots
Every year since 1997, researchers from different countries have gathered to compete in the world championships of robotic soccer. The event has drawn a substantial amount of interest from both industry as well as the general public. The latest RoboCup world championship tournament took place in July 2004 in Lisbon (Portugal) with a total attendance of 224 teams from 34 countries competing for the titles in more than 5 different disciplines. One of these disciplines is the RoboCup Soccer Simulation League also known as 'Soccer Server' League.


Soccer Server is an educational tool for research on multi-agent systems and artificial intelligence (AI). It allows two teams of 11 simulated players (autonomous agents) to play soccer against each other. Matches are carried out on a virtual pitch: The so-called 'soccer server' is a system that simulates the environment, i. e. the pitch itself, the wind conditions, the location and the velocity of the ball, reactions to the player's commands, etc. Each individual player is a client program written in C, C++, Java, etc. Communication between server and clients is built upon the socket based protocol UDP/IP. A match can be visualized using special monitor programs.


Soccer Server simulates movements of a ball and players, communicates with clients, and controls a game according to rules. To control a player, the corresponding client program needs to send requests to the server regarding the actions it wants to perform (e.g. kick the ball, turn, run, etc.). The server receives those messages, handles the requests, and updates the environment accordingly. In addition, the server provides all players with sensory information (e.g. visual data regarding the position of the ball, goals, and other players). It is important to mention that the server is a real-time system working with discrete time intervals (or cycles). Each cycle has a specified duration, and actions that need to be executed in a given cycle, must arrive to the server during the right interval. Therefore, slow performance that results in missing acting opportunities has a major impact on the performance of the team.


The reigning world champion of the RoboCup Simulation League (2004) is the team ‘STEP’ of the ElectroPult Plant in Russia. Second and third place went to the University of Dortmund (Germany) and Allameh Helli High School (Iran), respectively. Previous winners included the State Key Laboratory of Intelligent Technology and Systems at TsingHua University in China (2001, 2002), the University of Porto (2000), Carnegie Mellon University (1998, 1999) and Humboldt University (1997).

(Frank Wornle)

 
     
 
Human Computer Interface
Humans communicate with computers in a variety of different ways (e.g. haptic devices, speech recognition program). Such interfaces require a hardware device for mediation between the human and the computer to translate a motion variable to a binary number that the computer can then process.

A Brain Computer Interface (BCI) is a system that acquires and analyses Electroencephalogram (EEG) signals with the goal of creating a high bandwidth communications channel directly between the brain and the computer. It has been used to navigate mobile robots. It gives disabled people a chance to communicate and navigate. BCI suffers with the issues related to modelling and acquisition of EEG signals. All this affects accuracy of the BCI system. Based on the Electrooculogram (EOG) signals, an eye control method serves the same purpose as the BCI. Compared to the EEG, modelling and recording of the EOG signals is far easier.

A simple experiment has been set up to gain some experience with the technology required to build a reliable HCI system. During this experiment, a variety of signals were picked up using simple tin electrodes. The signals were amplified, digitized and analysed in MATLAB. The experiment aimed at controlling the motion of a small mobile robot and was showcased a the university's open day, 2006.

(Jayesh L. Minase and Frank Wornle)

 
Open day experiment
During the open day display, a small mobile robot was steered using eye-blink signals.
Electrode locations
Location of electrode to capture signals when eye blinks
Mobile robot
 
Dynamic modeling, estimation and control of piezoelectric actuator with application in micro-motion system
Over the last 30 years numerous micro-motion systems have been developed to perform a vast range of micro-positioning tasks. These systems have used different methods to provide fine-accuracy motion. To provide the finest-accuracy motion the most commonly used core components of micro-motion stages are fine resolution actuators and compliant mechanisms. Piezoelectric, electromagnetic, electrostatic and shape memory alloy actuators can be displaced by an almost small amount in nanometers. Of these, piezoelectric actuators are the most commonly used. Their resolution is limited only by the noise in the applied voltage signal and the quality of the sensors used to monitor their resulting motion; sub-nanometer resolution is achievable. The 3 DOF micro-motion stage in the proposed study uses piezoelectric stack actuators to drive a compliant mechanism that, in turn, provides micro-motion. The piezoelectric stack actuators are built using multiple piezoelectric discs wired in parallel and placed mechanically in series.

Fast and accurate reference tracking of the micro-motion stage requires a feedback controller. Various control schemes have been proposed. Among these, model based controllers show promising results. However, using inaccurate models of the dynamics of the piezo actuator may lead to instability in the feedback loop of the micro-motion control system. It is therefore important to accurately describe the dynamics of the piezo actuator. This research project focuses on the methodology of deriving a simple but accurate model of the dynamics of the piezo actuator.

(Jayesh L. Minase, Tien-Fu Lu and Ben S. Cazzolato)

 
     
 
Design and Build a Small Airship
This honours project involved the design, build and flight testing of a small-scale airship for surveillance, aerial photography and advertising purposes. The airship was designed to be capable of continuous indoor flight for 30 minutes carrying a 500g payload while maintaining a constant altitude. The methodology and outcomes of similar university research projects were examined to gain a better understanding of airship design principles.

Four distinct flight regimes were considered: takeoff, hover, cruise and landing. Flight parameters such as maximum speed, cruise altitude and takeoff time were defined so that a theoretical force analysis could be conducted. The thrust required in each flight regime was then determined based on calculation of the lift, weight and drag forces.

Four sections were identified as crucial in the airship design: the envelope, gondola, propulsion system and control system. An iterative procedure was developed to optimise the envelope design based on the weight of components and the lifting force needed to achieve neutral buoyancy. The conceptual design of the gondola focussed on reducing weight whilst still having enough strength to support the weight of the internal components. Ducted fans powered by electric motors were chosen to provide propulsion to the airship. The effects of different fan arrangements on airship manoeuvrability were then analysed. The thrust output of the ducted fans was controlled by manual and automatic systems. An RC hand unit provided full manual control while the cruise altitude and pitch of the airship were maintained automatically using an ultrasonic sensor and clinometer, respectively.

The detailed design was developed using the most suitable concept design alternatives. Components such as motors, fans, batteries and automatic control parts were selected based on technical suitability and budget limitations. The final design used a commercially manufactured envelope propelled by four ducted fans, each with variable thrust output. Two manually controlled fans on the side of the gondola were used for yaw control while two downward facing fans provide upward thrust and pitch control.

Testing of all individual components was conducted prior to testing of the completed airship. This ensured that the ducted fans, radio controller, camera and automatic control system operated correctly. Two airship envelopes were manufactured and each was tested in a full flight test with the gondola attached. The two flight tests demonstrated that the automatic control system functioned as designed and could be used simultaneously with the manual control system. The flight tests also showed that the airship was capable of meeting the performance requirements set in the project definition.

The majority of the project goals were achieved in the two flight tests. It is hoped that the work undertaken in the project could be adapted and refined by final year students in the future to design an airship capable of outdoor flight with a more advanced control system.

(Maziar Arjomandi, Nicholas James Bartel, Michael Jens-Christian Nordestgaard and Lachlan Ravenscroft)

 
Filling
Flying
The team
 
Micro Air Vehicle
The aim of this honours project was to design, build and fly a micro air vehicle with flapping wing mechanism. The vehicle should be as small and light as possible with a low cruising speed. It is anticipated that the aircraft will be propelled by one or more electric motors and be controlled using a radio control system.

(Maziar Arjomandi, Richard Kelso, Craig Michael Gerrard, Richard Hillan, Matthieu Richard Nelson and Mathew Thomas Ward)

 
DragonFly - Close up
DragonFly - Landed on Gras
DragonFly - Flying over the river Torrens
 
Search and rescue UAV
This honours project involves the design and construction of an autonomous Unmanned Aerial Vehicle (UAV). The aircraft has been designed for civil applications such as surveillance or search and rescue missions by incorporating imaging equipment and payload deployment capabilities.

The multipurpose platform has been configured to take part in the Australian Research Centre for Aerospace Automation’s UAV Outback Challenge to be held in Queensland in September, 2007. For successful entry into this challenge, the UAV must demonstrate the ability to locate and assist a human lost in the Australian outback. A broad study of similar UAVs indicated a conventional design was most suitable for the platform.

The aircraft is manufactured primarily from composite materials using a female mould process. The wings, spanning two metres have a foam core with carbon fibre spars. An electric power plant delivering 4 kilograms of static thrust powers the aircraft with a predicted maximum speed of 120km/hr and an endurance of one hour. The control system incorporates a Micropilot 2028 autopilot enabling autonomous flight and remote communication over a range of 10 kilometres. An analogue camera, mounted in the rear of the aircraft will stream images over a 10 kilometre range with 450 TV lines and a 70 degree field of view.

Testing has been conducted for a parachute recovery system and a descent rate of 5.5 m/s is expected. When launched from a car the aircraft will also be capable of deploying a 600 gram payload.

(Maziar Arjomandi, Nayan Uday Avalakki, Jonathan Bannister, Benjamin John J. Chartier, Travis Mark Downie, Brad Alexander A. Gibson, Crystal Rhiannon Gottwald, Peter Ian Moncrieff and Michael Scott Williams)

 
 
Wing Borne HydroFoil (WBHF)
The Wingborne Hydrofoil (WBHF) is a high performance marine craft, conceptualised and developed theoretically by Mr. Stephen Bourn. In 2007 undergraduate students commenced a project with the aim to design and manufacture a fullscale functional prototype of a 'Wing-Borne Hydrofoil'. The basis of this design differs from the majority of high-speed sailing craft in that it utilises a wing rather than a conventional sail. The ability of the wing to adjust to the optimal angle relative to the wind gives the WBHF the capability to tack (and hence sail) both upwind and downwind. Furthermore by tacking the craft downwind the craft is able to sail faster than the wind. Another distinguishing feature of the WBHF is its ability to lift the hull out of the water when the craft achieves sufficient velocity, thus eliminating a significant source of drag, and hence accelerating the craft to considerably high speeds. Other design features that contribute to the high performance and safety of the craft include the ability to self-correct and stabilise when the craft becomes unbalanced, the quick release of the wing, customized hydrofoil design suited exclusively to this application and lightweight design of the craft, attained using non-conventional materials and manufacturing methods. The craft employs several control systems to ensure stability once flight is achieved and also provide pilot control. Given these unique characteristics, it is believed the WBHF has the potential to challenge several sailing records including the bi-directional nautical mile sailing speed record and ultimately the world sailing speed record.

(Ben S. Cazzolato, Carl Q. Howard, Danya J. Cheng, Keith Robert R. Crouch, Thomas James Hill, Joshua Johannes Holmes, Ashok Athreya Kaniyal, Antoni Alexander Kourakis, Heath Andrew Nankivell, Benjamin Andrew Ford Newbery, Luke Joseph Rogers and Zhi Qiu Xia)

 
Wing Borne HydroFoil (WBHF)
Hull sections joined
Two carbon fibre halves being joined.
Bearing section view
Bearings used in coupling main beam to hull and outrigger float.
 
Whole Craft
Bulb clear
Assembly view of the hydrofoil bulb with transparent mid-section and nose cone.
Bulb cutaway
Cut-away view of the hydrofoil bulb mid-section.
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Adelaide Robotics Research Group

The Adelaide Robotics Research Group was formed in 2002 to further research into robotics at the University of Adelaide. Areas which are of particular interest to the group include micro-motion manipulators, robotic measurement systems, mobile robotics and the modelling of insects through robotics.
 
ECP Control Moment Gyroscope
The four axis Control Moment Gyroscope is a dynamically rich system that provides superb demonstrations of multi-DOF rigid body control. Elementary experiments are readily performed that readily show the fascinating phenomenon of gyroscopic torque and its use in precision high authority control. More advanced topics range from MIMO linear control to fully general nonlinear control with singularity avoidance. Thus the system yields demonstrations that are intriguing to the layman and post-doctorate alike! In addition, the plant may be used to emulate the control of satellite attitude. Stimulating experiments first show the open loop nutation modes and then demonstrates their effective control.

The apparatus includes low friction slip rings at axes 3 and 4 for unlimited range of motion, and precision encoders for feedback of all position and velocity states. High torque density rare earth magnet motors drive the rotor and inner gimbal. A host of safety features such as fail-safe brakes, inertial switches, and real-time watch-dog monitoring provide for safe operation of the apparatus

Simulink Non-linear and VR Model

A Simulink model of the Control Moment Gyroscope system has been built employing an embedded m function of the dynamics derived by ECP and a model provided by Dr. Richard G. Cobb at the Air Force Institute of Technology, Wright Patterson AFB. The Simulink model is based on the default model that comes with the ECP real-time Simulink Option. A Virtual Reality Model (VRML) has been developed by the School of Mechanical Engineering, The University of Adelaide to allow one to visualise the plant response in virtual reality. You will need the VRML Texture Image file for the VRML model. Save all these in your working directory.

Simulink Real-Time Windows Target

It is possible to operate the CMG using Mathworks Real-Time Windows Target. This also requires the ECP real-time Simulink Option. We have developed a real-time Simulink model which initialises the control card, then commences a number of different control examples based on the tests in the manual. The initialisation m file is also needed. Please note that this file is still being developed and needs further work.

(Ben S. Cazzolato, Sajeeva N. Abeywardena and Scott Beinke)

 
   
 
NXTway-GS (Self-Balancing Two-Wheeled Robot)
NXTway-GS (Gyro Sensor) is a self-balancing two-wheeled robot built with LEGO Mindstorms NXT and a Hitechnic gyro sensor originally developed by Yorihisa Yamamoto.

There are many NXTway using HiTechnic Gyro Sensor on the web (most famous and the original one is Ryo Watanabes NXTway-G). This nxtOSEK version of NXTway with HiTechinic Gyro Sensor (called NXTway-GS) shows excellent performance (very robust against disturbance, runs and turns on flat floor/slope/rough road controlled by Bluetooth based R/C). The application program of NXTway-GS is designed in Embedded Coder Robot NXT and automatically generated floating point ANSI-C source code with nxtOSEK is implemented into the robot.

(Ben S. Cazzolato)

 
   
 
Hexapod Robot Control System for Biomechanics Testing
Hexapod Robots (or Stewart Platforms) are used in many applications where precise six degree of freedom (6 DOF) position and motion control are required. A few of the industries using this design include aerospace, automotive, nautical, and machine tool technology. Hexapod Robots have been used to simulate flight, model a lunar rover, build bridges, aid in vehicle maintenance, design crane hoist mechanisms, position satellite communication dishes and telescopes, among other tasks.

A novel design of a Hexapod Robot is underway at the School of Computer Science, Engineering & Mathematics, Flinders University and the School of Mechanical Engineering, University of Adelaide, to enable complex 6 DOF testing of bones, joints, soft tissues, artificial joints and other medical/surgical devices. The project is being funded by funds awarded to Dr Costi from Foundation Daw Park, Repatriation General Hospital, The Health and Medical Research Fund, Department of Health, SA Government, and jointly by the School of Computer Science, Engineering & Mathematics and the Faculty of Science & Engineering, Flinders University. The University of Adelaide is providing in-kind support, primarily in the design of the controller and human-machine-interface. The current hexapod is based heavily on the very successful Hexapod developed at the UVM by Ian Stokes et al..

The system is comprised of the following:
- Six Aerotech BM Series Brushless Servo Motors to actuate the legs
- Six Aerotech Soloist Servo Amplifiers to drive the motors and provide some fault diagnostics
- The motors are coupled to Edrive Ballscrew Linear Actuators
- Linear encoders are employed (in conjunction with the rotary encoders in the servo motors) to ensure absolute positioning control
- An AMTI load cell provides load feedback for the 3 forces and 3 moments generated by the manipulator
- Control of the entire system is being implemented using National Instruments hardware and Labview. The system operates a host/target configuration using Labview RealTime. The majority of the high-level control functions are performed on the realtime PXI target. High speed control of the position or load servo loops are performed on FPGAs. The figure below shows the architecture of the control hardware.

Currently the mechanical design is being finalised to minimise compliance. A control system to operate the Hexapod Robot in six degrees of freedom under closed-loop position or load control is being developed. Successful dual-loop control has been achieved for each of the leg, and the global controller for the kinematics and trajectory generation is well underway. A user-friendly GUI to allow input of required testing parameters and logging of data is also underway.

(Ben S. Cazzolato, John Costi, Boyin Ding and Richard Stanley)

 
 
Strain sensing using a 3D scanning laser vibrometer

The recent advent of three-dimensional scanning laser vibrometers has enabled extremely accurate non-contact measurement of the three-dimensional displacements of structures. This research has developed a technique using a Polytec 3D scanning laser vibrometer for the non-contact measurement of strain field across the surface of a planar structure.

The technique uses a finite-difference scheme to convert the displacement measurements at a number of discrete points to a first-order strain estimate. Laser head alignment is critical to the process, so system upgrades such as the following are critical for small objects:

  • PSV-S-TRIA: Option for optimizing the measurement point geometry by image processing.
  • PSV-A-450: Reference object supporting for a precise 3D-alignment of the sensor heads of PSV-400-3D(-M). Precisely machined and marked reference points with known coordinates allow a well defined basic alignment of the PSV measurement system for improved accuracy.
  • PSV-A-T34: Rigid support of 3 PSV-I-400 scan heads. Intended for small objects. The angle between the scan heads is optimized towards a well balanced resolution in all vibrational components.
  • A-CAZ-1000: Digital Camera, resolution 1034x779 pixels, monochrome, macro zoom lens, 8.5mm -90mm, smallest field of view 6x8 mm. Provides higher resolution then the internal camera of the PSV-I-400 for small sized objects and short working distances.
The results achieved to date have been very promising, and with planned system upgrades (listed above) it is expected that grid sizes less than 1mm should be possible. Preliminary experimental results of a test specimen were presented at the Acoustics 2008 conference, which clearly demonstrate the significant potential this new experimental technique has. The figures below shows a comparison between the theoretical strain distribution and the strain measurements for a uni-axially loaded rectangular plate with a hole.

(Ben S. Cazzolato, John Codrington, Andrei Kotousov and Stuart Wildy)
 
 

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